sh: sh7757lcr: add supporting for MMCIF

The sh7757lcr has 2GByte eMMC chip. This patch supports it.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/doc/README.sh7757lcr b/doc/README.sh7757lcr
index 37c1a7a..3e9c1c1 100644
--- a/doc/README.sh7757lcr
+++ b/doc/README.sh7757lcr
@@ -12,6 +12,7 @@
  - SPI ROM 8MB
  - 2D Graphic controller
  - Ethernet controller
+ - eMMC 2GB
 
 
 configuration for This board: